Antialiasing feature restored

Merge pull request #59 from quephird/fix_antialiasing

Fix antialiasing

Support for multiple lights

Merge pull request #58 from quephird/experimental_multiple_lights

Support for multiple lights, including ones with a fade distance

Updated API and new parametric surface primitive

Merge pull request #53 from quephird/add_parameter_labels

Add parameter labels to all public API call sites

v0.0.7: Merge pull request #31 from quephird/fixing_readme

Fix some more typos in the README

v0.0.6: Merge pull request #16 from quephird/make_material_a_property_modifier

Make material a property modifier

v0.0.5: Merge pull request #14 from quephird/explore_anti_aliasing

Introduce antialiasing and make it optional

v0.0.4: Merge pull request #9 from quephird/implememt_soft_shadows

Implememt soft shadows

v0.0.3: Merge pull request #3 from quephird/improve_app_protocol

Output filename is now that of the class name with the ppm extension.

v0.0.2: Merge pull request #2 from quephird/add_new_app_protocol

First try at adding new protocol for creating an app.

v0.0.1

Merge pull request #1 from quephird/fix_access_control

Properly set up tests module.